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MyBatis MySQL Oracle 分页插件

MyBatis 的 MySQL、Oracle 分页插件,使用相同的分页接口。

 

/**
 * 分页对象.
 * 
 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
 * @version 1.0.1.0, Oct 6, 2012
 */
public final class Page implements Serializable {
  1/**
  2 * 默认的序列化版本 id.
  3 */
  4private static final long serialVersionUID = 1L;
  5/**
  6 * 分页查询开始记录位置.
  7 */
  8private int               begin;
  9/**
 10 * 分页查看下结束位置.
 11 */
 12private int               end;
 13/**
 14 * 每页显示记录数.
 15 */
 16private int               length           = 20;
 17/**
 18 * 查询结果总记录数.
 19 */
 20private int               totalRecords;
 21/**
 22 * 当前页码.
 23 */
 24private int               pageNo;
 25/**
 26 * 总共页数.
 27 */
 28private int               pageCount;
 29
 30public Page() {
 31}
 32
 33/**
 34 * 构造函数.
 35 * 
 36 * @param begin
 37 * @param length
 38 */
 39public Page(int begin, int length) {
 40    this.begin = begin;
 41    this.length = length;
 42    this.end = this.begin + this.length;
 43    this.pageNo = (int) Math.floor((this.begin * 1.0d) / this.length) + 1;
 44}
 45
 46/**
 47 * @param begin
 48 * @param length
 49 * @param count
 50 */
 51public Page(int begin, int length, int totalRecords) {
 52    this(begin, length);
 53    this.totalRecords = totalRecords;
 54}
 55
 56/**
 57 * 设置页数,自动计算数据范围.
 58 * 
 59 * @param pageNo
 60 */
 61public Page(int pageNo) {
 62    this.pageNo = pageNo;
 63    pageNo = pageNo &gt; 0 ? pageNo : 1;
 64    this.begin = this.length * (pageNo - 1);
 65    this.end = this.length * pageNo;
 66}
 67
 68/**
 69 * @return the begin
 70 */
 71public int getBegin() {
 72    return begin;
 73}
 74
 75/**
 76 * @return the end
 77 */
 78public int getEnd() {
 79    return end;
 80}
 81
 82/**
 83 * @param end
 84 *            the end to set
 85 */
 86public void setEnd(int end) {
 87    this.end = end;
 88}
 89
 90/**
 91 * @param begin
 92 *            the begin to set
 93 */
 94public void setBegin(int begin) {
 95    this.begin = begin;
 96    if (this.length != 0) {
 97        this.pageNo = (int) Math.floor((this.begin * 1.0d) / this.length) + 1;
 98    }
 99}
100
101/**
102 * @return the length
103 */
104public int getLength() {
105    return length;
106}
107
108/**
109 * @param length
110 *            the length to set
111 */
112public void setLength(int length) {
113    this.length = length;
114    if (this.begin != 0) {
115        this.pageNo = (int) Math.floor((this.begin * 1.0d) / this.length) + 1;
116    }
117}
118
119/**
120 * @return the totalRecords
121 */
122public int getTotalRecords() {
123    return totalRecords;
124}
125
126/**
127 * @param totalRecords
128 *            the totalRecords to set
129 */
130public void setTotalRecords(int totalRecords) {
131    this.totalRecords = totalRecords;
132    this.pageCount = (int) Math.floor((this.totalRecords * 1.0d) / this.length);
133    if (this.totalRecords % this.length != 0) {
134        this.pageCount++;
135    }
136}
137
138/**
139 * @return the pageNo
140 */
141public int getPageNo() {
142    return pageNo;
143}
144
145/**
146 * @param pageNo
147 *            the pageNo to set
148 */
149public void setPageNo(int pageNo) {
150    this.pageNo = pageNo;
151    pageNo = pageNo &gt; 0 ? pageNo : 1;
152    this.begin = this.length * (pageNo - 1);
153    this.end = this.length * pageNo;
154}
155
156/**
157 * @return the pageCount
158 */
159public int getPageCount() {
160    if (pageCount == 0) {
161        return 1;
162    }
163    return pageCount;
164}
165
166/**
167 * @param pageCount
168 *            the pageCount to set
169 */
170public void setPageCount(int pageCount) {
171    this.pageCount = pageCount;
172}
173
174@Override
175public String toString() {
176    final StringBuilder builder = new StringBuilder("begin=").append(begin).append(", end=")
177            .append(end).append(", length=").append(length).append(", totalRecords=").append(
178                    totalRecords).append(", pageNo=").append(pageNo).append(", pageCount=")
179            .append(pageCount);
180
181    return builder.toString();
182}

}

 

/**
 * Oracle 分页生成插件。
 *
 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
 * @version 1.0.0.0, May 31, 2012
 */
public class OraclePaginationPlugin extends PluginAdapter {
 1@Override
 2public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
 3        IntrospectedTable introspectedTable) {
 4    // add field, getter, setter for limit clause
 5    addPage(topLevelClass, introspectedTable, "page");
 6    return super.modelExampleClassGenerated(topLevelClass, introspectedTable);
 7}
 8
 9@Override
10public boolean sqlMapDocumentGenerated(Document document, IntrospectedTable introspectedTable) {
11    XmlElement parentElement = document.getRootElement();
12
13    // 产生分页语句前半部分
14    XmlElement paginationPrefixElement = new XmlElement("sql");
15    paginationPrefixElement.addAttribute(new Attribute("id", "OracleDialectPrefix"));
16    XmlElement pageStart = new XmlElement("if");
17    pageStart.addAttribute(new Attribute("test", "page != null"));
18    pageStart.addElement(new TextElement(
19            "select * from ( select row_.*, rownum rownum_ from ( "));
20    paginationPrefixElement.addElement(pageStart);
21    parentElement.addElement(paginationPrefixElement);
22
23    // 产生分页语句后半部分
24    XmlElement paginationSuffixElement = new XmlElement("sql");
25    paginationSuffixElement.addAttribute(new Attribute("id", "OracleDialectSuffix"));
26    XmlElement pageEnd = new XmlElement("if");
27    pageEnd.addAttribute(new Attribute("test", "page != null"));
28    pageEnd
29            .addElement(new TextElement(
30                    "&lt;![CDATA[ ) row_  where rownum &lt;= #{page.end} ) where rownum_ &gt; #{page.begin}  ]]&gt;"));
31    paginationSuffixElement.addElement(pageEnd);
32    parentElement.addElement(paginationSuffixElement);
33
34    return super.sqlMapDocumentGenerated(document, introspectedTable);
35}
36
37@Override
38public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(XmlElement element,
39        IntrospectedTable introspectedTable) {
40
41    XmlElement pageStart = new XmlElement("include"); //$NON-NLS-1$   
42    pageStart.addAttribute(new Attribute("refid", "OracleDialectPrefix"));
43    element.getElements().add(0, pageStart);
44
45    XmlElement isNotNullElement = new XmlElement("include"); //$NON-NLS-1$   
46    isNotNullElement.addAttribute(new Attribute("refid", "OracleDialectSuffix"));
47    element.getElements().add(isNotNullElement);
48
49    return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element, introspectedTable);
50}
51
52/**
53 * @param topLevelClass
54 * @param introspectedTable
55 * @param name
56 */
57private void addPage(TopLevelClass topLevelClass, IntrospectedTable introspectedTable,
58        String name) {
59    topLevelClass.addImportedType(new FullyQualifiedJavaType(
60            "com.yuanxin.framework.mybatis.Page"));
61    CommentGenerator commentGenerator = context.getCommentGenerator();
62    Field field = new Field();
63    field.setVisibility(JavaVisibility.PROTECTED);
64    field.setType(new FullyQualifiedJavaType("com.yuanxin.framework.mybatis.Page"));
65    field.setName(name);
66    commentGenerator.addFieldComment(field, introspectedTable);
67    topLevelClass.addField(field);
68    char c = name.charAt(0);
69    String camel = Character.toUpperCase(c) + name.substring(1);
70    Method method = new Method();
71    method.setVisibility(JavaVisibility.PUBLIC);
72    method.setName("set" + camel);
73    method.addParameter(new Parameter(new FullyQualifiedJavaType(
74            "com.yuanxin.framework.mybatis.Page"), name));
75    method.addBodyLine("this." + name + "=" + name + ";");
76    commentGenerator.addGeneralMethodComment(method, introspectedTable);
77    topLevelClass.addMethod(method);
78    method = new Method();
79    method.setVisibility(JavaVisibility.PUBLIC);
80    method.setReturnType(new FullyQualifiedJavaType("com.yuanxin.framework.mybatis.Page"));
81    method.setName("get" + camel);
82    method.addBodyLine("return " + name + ";");
83    commentGenerator.addGeneralMethodComment(method, introspectedTable);
84    topLevelClass.addMethod(method);
85}
86
87/**
88 * This plugin is always valid - no properties are required
89 */
90@Override
91public boolean validate(List&lt;String&gt; warnings) {
92    return true;
93}

}

 

/**
 * MySQL 分页生成插件。
 *
 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
 * @version 1.0.0.1, Oct 10, 2012
 */
public final class MySQLPaginationPlugin extends PluginAdapter {
 1@Override
 2public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
 3        IntrospectedTable introspectedTable) {
 4    // add field, getter, setter for limit clause
 5    addPage(topLevelClass, introspectedTable, "page");
 6    return super.modelExampleClassGenerated(topLevelClass, introspectedTable);
 7}
 8
 9@Override
10public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(XmlElement element,
11        IntrospectedTable introspectedTable) {
12    XmlElement page = new XmlElement("if");
13    page.addAttribute(new Attribute("test", "page != null"));
14    page.addElement(new TextElement("limit #{page.begin} , #{page.length}"));
15    element.addElement(page);
16
17    return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element, introspectedTable);
18}
19
20/**
21 * @param topLevelClass
22 * @param introspectedTable
23 * @param name
24 */
25private void addPage(TopLevelClass topLevelClass, IntrospectedTable introspectedTable,
26        String name) {
27    topLevelClass.addImportedType(new FullyQualifiedJavaType(
28            "com.yuanxin.framework.mybatis.Page"));
29    CommentGenerator commentGenerator = context.getCommentGenerator();
30    Field field = new Field();
31    field.setVisibility(JavaVisibility.PROTECTED);
32    field.setType(new FullyQualifiedJavaType("com.yuanxin.framework.mybatis.Page"));
33    field.setName(name);
34    commentGenerator.addFieldComment(field, introspectedTable);
35    topLevelClass.addField(field);
36    char c = name.charAt(0);
37    String camel = Character.toUpperCase(c) + name.substring(1);
38    Method method = new Method();
39    method.setVisibility(JavaVisibility.PUBLIC);
40    method.setName("set" + camel);
41    method.addParameter(new Parameter(new FullyQualifiedJavaType(
42            "com.yuanxin.framework.mybatis.Page"), name));
43    method.addBodyLine("this." + name + "=" + name + ";");
44    commentGenerator.addGeneralMethodComment(method, introspectedTable);
45    topLevelClass.addMethod(method);
46    method = new Method();
47    method.setVisibility(JavaVisibility.PUBLIC);
48    method.setReturnType(new FullyQualifiedJavaType("com.yuanxin.framework.mybatis.Page"));
49    method.setName("get" + camel);
50    method.addBodyLine("return " + name + ";");
51    commentGenerator.addGeneralMethodComment(method, introspectedTable);
52    topLevelClass.addMethod(method);
53}
54
55/**
56 * This plugin is always valid - no properties are required
57 */
58public boolean validate(List&lt;String&gt; warnings) {
59    return true;
60}

}

 

使用时在 generatorConfig.xml 中配置对应的插件即可,最终,在生成的 Criteria 中就会存在 Page 字段,用于设置分页。